Perseus, a mythological figure

Perseus, a GWR Iron Duke Class steam locomotive

Perseus (constellation), a constellation in the northern sky

Perseus of Macedon, the last King of Macedon

Bristol Perseus, an aero engine

USNS Perseus (T-AF-64), American stores ship

Perseus (geometer), an ancient Greek mathematician

Perseus (spy), a Soviet spy at White Sands Missile Range

Perseus Project, a digital library

Perseus Cluster, galaxy cluster

Perseus Arm, an arm of the Milky Way

Perseus molecular cloud

HMS Perseus, any one of several ships of the Royal Navy

Perseus-Pisces Supercluster, galaxy cluster chain

USS Perseus, name used by multiple American ships

Perseus (single), Hitomi Shimatani song

Operation Perseus, a British police operation

Perseus is a member of the Pantheon, a fictional group from Marvel Comics.